Those getting deported are those that doesn't manifest any sign of TB, yet failed the skin test. If there is manifestations already, they won't let you board the plane and transmit the disease to innocent victims.

Also, the scar is a minor thing, as there are hundreds of reason for having a scar in the lung, including trauma-related ones. It is the blood test that would confirm your condition, and use it to rule out what was seen in the X-ray. If you continue the habit of smoking, then don't raise your hopes too high, as chances of you passing the test will be minimal. You recovered from TB and continue smoking, you already know what will happen to your lung. Worst is if you develop another strain of PTB.

Good luck.